Air-exhaust for revolving steam drying or heating cylinders.



Nu. 705,305. Patented July 22, I902.

' T. H. SAVEBY. AIR EXHAUST .FOR REVOLVING STEAM DRYINGQR HEATINGCYLINDERS;

(Appliution filed Mar. 3, 1900.)

(No Model.)

z Nonms wrrzns cu. PHOTO-LITNO. WASNINGTON. n. c. 7

UNITED L STATES PATENT OFFICE.

THOMAS H. SAVERY, OF \VILMINGTON, DELAVVARE.

AIR-EXHAUST FOR REVOLVING STEAM DRYING 0R HEATlNG CYLINDERS.

SPECIFICATION forming part of Letters Patent No. 705,305, dated July 22,1902.

Application filed March 3,1900. Serial No. 7,180. (No model.)

following specification and the accompany ing drawings, forming a partof the same.

This invention relates to certain improvements in revolving steam dryingor heating cylinders or drums.

It has been found that it is difficult to quickly heat up to the propertemperature revolving steam heating or drying cylinders or drumssuch,for instance, as the revolving cylinders or drums which are used inbleaching and drying paper-stock-this being due to the fact that airaccumulates in these cylinders or drums after the machines have stoppedand the cylinders or drums have become cold, and when the steam is againturned on this air prevents it from gettingto all parts of the cylindersor drums. Furthermore, more or less air is mixed with the steam which isconstantly flowing into the cylinders or drums during the operation ofthe machine. As the steam condenses this air remains in the cylinders ordrums, becoming trapped therein, and operates to prevent the steam fromgetting to all parts of the cylinders or drums, thus causing the Variousparts of the same to be unequally heated. This not only reduces theeificieney of the cylinders, but in the handling of paper stock causesthe production of streaky paper, due to the fact that some parts of thestock are dried more than other parts. I It is the object of thisinvention to provide improved means whereby the air which hasaccumulated in the revolving steam cylin ders or drums from any cause ispermitted to escape therefrom, whereby such drums or cylinders mayberapidly brought up to a working temperature when the machines arestartedand maintained at an even temperature duringthe runs.

With this object in view the invention consists in certain constructionsand in certain ,parts, improvements, and combinations, as

will be hereinafter fully described and then pointed out in the claimshereunto appended.

In the accompanying drawings, which form a part of this specification,and in which like characters of reference indicate the same parts,Figure 1 is a longitudinal vertical seccylinder or drum. Fig. 2 is asection on the line 2 2 of Fig. 1 looking in the direction of the arrowin said figure. Fig. 3 is a detail illustrating the joint between two ofthe pipes. Fig. 4 is a sectional view on the line 4 4 of Fig. 1 lookingin the direction of the arrow in said figure. Fig. 5 is a detail View ofthe air-outlet pipe, illustrating a modified form of the same.

Referring to the drawings, 1 indicates a revolving steam drying orheating cylinder or drumsuch, for instance, as the drier drum orcylinder commonly used in papermaking machinery. This drum is providedwith heads 2 and 3, which are secured to the drum in any suitablemanner, the head 2 .being provided with a manhole 4, as is usual.

Projecting from the head 2 is a journal 5, this journal being mounted inany suitable bearing-such, for instance, as the one indicated at 6.Extending from the head 3 is a journal 7, this journal being mounted ina bearing 8. The journal 5 is or may be provided with a gear-wheel 9, bywhich the drum is rotated and has secured to it in any suitable .manner,as by, bolts, a'projection 10, said projection extending toward apipe-support 11, which is mounted in any suitable or desired manner.(Not'showm) Between this pipe-support 11 and the end of the projection10 is located an annular steam-valve 12, said valve fitting againstseats on the projection 10 and the pipe-support'll. The projection 10 issurrounded by a collar 13, said collar being secured to bolts 14, whichextend from the pipe-support 11. i Springs 15 are located between thebolts and the collar, the purpose of this construction being toyieldingly force together the projection 10, the valve 12, and thepipe-support 11, thus -causing the valve to be snugly seated against theseats on the projection and the support.

The construction so far described forms a joint which is steam-tightwhen the pressure .tion of the revolving steam drying or heating of thesteam in the cylinder or drum is normal, but which will yield when saidpressure becomes excessive. This construction is fully shown anddescribed in Patent No. 635,512, granted October 24, 1899, to me, andreference is made to said patent for a fuller disclosure of theconstruction, the description already given being sufficient for thepurpose of this application.

Connected to the pipe-support 11 is a steampipe 16, said pipe extendinginwardly from said support through the hollow journal 5 andcommunicating with the interior of the drum or cylinder 1. A curvedsiphon drainpipe 17 is also shown as connected to the pipe-support 11and as extending therefrom through the hollow journal 5 into the drum. Apipe 18, which is connected to any suitable source of steam-supply,admits steam to a chamber in the pipe-support 11, after which it passesinto the drum through the steampipe 16. A pipe 19 communicates withanotherchamber in the pipe-support, said chamber being in communicationwith the siphon drain-pipe 17.

By the construction so far described means are provided for admittingsteam to the drum and for removing water of condensation therefrom. Ithas been found, however, in the practical working of steam drying orheating cylinders or drums such as are herein described that aconsiderable length of time is required to heat them up to a workingtemperature, owing to the fact that the air which accumulates in thecylinders 01' drums when the machines are not running prevents the steamfrom getting to the surfaces thereof. Furthermore, more or less air ismixed with the entering steam, and as the steam is constantly condensingthe air is left in the drums and accumulates therein, being trapped orpocketed in difierent parts of the drums. The result of thisis,particularly in paper-making machinery, that different parts of thedrums are differently heated, and a Streaky product results, because theparts of the drums which some portions of the product come in contactwith are much hotter than other parts. In order, therefore, to permitthe air which for any reason has accumulated in the drums or cylindersto escape, the drums or cylinders are provided with air-outlet pipes.These air-outlet pipes may be variously constructed, located, andarranged. In the construction shown, however, the outlet of air iseffected by a pipe 20, which in the preferred form of the constructionextends across the cylinder from end to end. This pipe 20 may beprovided with any suitable means for admitting into it the air which isaccumulated in the cylinder. In some instances the air may be admittedthrough perforations in the pipe, and such a construction is shown inFig. 5. A pipe having a long slot or slots trated in Figs. 1 and 3.

vided with a plurality of pipes 21, which extend from it toward thesurface of the cylinder. In some instances practical working of thecylinders has shown that the air seems to accumulate in zones throughoutthe length of the cylinder, said zones apparently lying near the surfaceof the cylinder. The pipes 21 will be sufficiently numerous to tap thesezones and carry the accumulated air out of the cylinder.

The pipe 20 is preferably, though not necessarily, arranged near theaxial center of the cylinder, and while it might be continued outwardthrough the journals of the cylinder it is preferably connected to andsupported by two pipes 22 and 23. The pipe 23 is connected to the pipe20 by any suitable form of coupling, one being indicated at 24, and thispipe extends through a perforation in the journal 7. In order to providefor a tight joint between the pipe 23 and the journal 7, a suitablerecess or chamber is formed in the journal, and this recess is filledwith packing 25, the said packing lying between two collars 26 and 27,the whole forming a stuffingbox of ordinary description. In order toprevent any longitudinal movement of the pipe 23, it is provided with acollar 28, which is preferably located in a recess in the collar 26.

Anysuitable means maybe employed when necessary to prevent the pipe 23from rotating with the journal. In the construction shown this pipe hassecured to it, by means of a set-screw 29 or in any other suitablemanner, an arm 30, said arm being in contact with a pin or projection31, extending from the bearing 8.

The connection between the pipe 22 and the pipe 20 is preferably formedby means of a sliding joint. The construction will preferably be thatshown in Fig. 3, in which the interior of the pipe 20 is provided with apinrality of circular recesses 32, said recesses forming a water-jointof ordinary construction. By means of this joint expansion andcontraction and the movement of the pipes, due to the movement betweenthe pipe-support 11 and the projection 10 when the steam in the boileris above normal, are provided for, and the pipes may be properlyadjusted when the machine is installed by reaching through the manhole4.

The pipe 22 preferably passes through the journal 5 and also preferablythrough the steam-pipe 16, which is located in said journal. Said pipe22 also passes through a perforation in the support 11, a suitablestuffingbox 33 being provided, if necessary, between said pipe and thesupport to form a tight joint.

Any suitable meansas, for instance, valves 34may be provided to controlthe escape of air from the pipes 22 and 23.

The operation of the construction is obvious. When steam is admitted tothe drum or cylinder at the time of starting the machine, one or both ofthe valves 34 are opened,

and the air is permitted to escape from the cylinder. When the air hasbeen driven out by the entering steam, the valves '34 may be closed. Insome instances, however, when it is found that air is accumulating inthe cylinder during the run of the machine either one or both of thevalves 34 may be left partly open, so as to allow the accumulated air toescape.

Changes and modifications may be made in the construction herein shown,and it will be understood, therefore, that the invention is not confinedto the specific details of the construction which has been herein shownand described.

What is claimed is 1. The combination with a revolving steam drying orheating cylinder or drum, of means for admitting steam thereto, anair-outlet pipe extending substantially across the cylinder or drum, anda plurality of pipes connected therewith and extending toward thesurface of the cylinder, substantially asidescribed.

2. The combination with a revolving-steam drying or heating cylinder ordrum, of means for admitting steam thereto, an air-outlet pipe extendingsubstantially across the cylinder or drum, means for supporting saidpipe near the axial center of the cylinder or drum, and a plurality ofpipes connected to said outlet-pipe and extending toward the surface ofthe cylinder or drum, substantially as described. l

3. The combination with a revolving steam drying or heating cylinder ordrum, of means for admitting steam thereto, means for removing the waterof condensation, an airoutlet pipe extending substantially across thecylinder or drum, and a plurality of pipes connected therewith andextending toward the surface of the cylinder or drum, substantially asdescribed.

4. The combination with a revolving steam drying or heating cylinder ordrum having a hollow journal, of means for admitting steam to thecylinder or drum, an air-outlet pipe, a pipe passing through the hollowjournal to which one end of the outlet pipe is connected by a slidingjoint, and means for supporting the other end of the outlet-pipe,substantially as described.

5. The combination with a revolving steam drying or heating cylinder ordrum having a hollow journal, of means for admitting steam to thecylinder or drum, an air-outlet pipe, a plurality of pipes extendingfrom the airoutlet pipe toward the surface of the cylinder, a pipepassing through the hollow journal to which one end of the outlet-pipeis connected by a sliding joint, and means for supporting the other endof the outlet-pipe, substantially as described.

6. The combination with a revolving steam drying or heating cylinder ordrum having a hollow journal, of a steam-inlet pipe passing through saidjournal, an air-outlet pipe extending substantially across the cylinderor drum, a pipe with which one end of the airoutlet pipe is connected bya sliding joint, said pipe passing through the steam-inlet pipe, andmeans for supporting the other end of the air-outlet pipe, substantiallyas described.

7. The combination with a revolving steam drying or heating cylinder ordrum having a hollow journal, of a steam-inlet pipe passing through saidjournal, an air-outlet pipe extending substantially across the cylinderor drum, a pipe with which one 'end of the airoutlet pipe is connectedby a sliding joint, said pipe passing through the steam-inlet pipe,means for supporting the other end 'of the air-outlet pipe, and aplurality of pipes connected to the air-outlet pipe and extending towardthe surface of the cylinder, substantially as described.

8. The combination with a revolving steam drying or heating cylinder ordrum having a hollow journal, of a steam-inlet pipe passing through saidjournal, a pipe for removing the water of condensation extending throughthe steam-pipe, an air-outlet pipe extending substantially across thecylinder, a pipe with which one end of said air-outlet pipe is connectedby a sliding joint, said pipe passing through the steam-pipe, and meansfor supporting the other end of the air-outletpipe, substantially asdescribed.

9. The combination with a revolving steam drying or heating cylinder ordrum having a ICC IIO

10. The combination with a revolving steam drying or heating cylinder ordrum, of a steaminlet pipe, an air-outlet pipe extending substantiallyacross the cylinder, or drum, and means whereby the air is permitted toescape from the air-outlet pipe at each'end of the cylinder,substantially as described.

11. The combination with a revolving steam drying or heating cylinder ordrum,of a steaminlet pipe, an air-outlet pipe extending substantiallyacross the cylinder or drum, and a pipe connected to each end of saidair-outlet pipe and extending outside the cylinder or drum, the jointbetween one of said pipes and the air-outlet pipe being a sliding joint,substantially as described.

12. The combination with a revolving steam drying or heating cylinder ordrum,of a steaminlet pipe, an air-outlet pipe extending substantiallyacross the cylinder or drum, a pipe connected to each end of saidair-outlet pipe and extending outside the cylinder or drum, the jointbetween one of said pipes and the air-outlet pipe being a sliding joint,and a plurality of pipes connected to the air-outlet pipe and extendingtoward the surface of the cylinder, substantially as described.

13. The combination with a revolving steam dryingorheatingcylinderordrum,ofasteaminlet pipe, an air-outlet pipe, a pipeto which one end of said air-outlet pipe is connected by a slidingjoint, and means for supporting the other end of said outlet-pipe,substantially as described.

14:. The combination with a revolving steam drying or heating cylinderor drum provided with journals, of a steam-inlet pipe, an airoutletpipe, a pipe to which said air-outlet pipe is connected, said pipepassing through one ofthe journals, suitable packing whereby a tightjoint is formed between the pipe and the journal, means for preventingsaid pipe from turning with thejournal, and a plurality of pipesconnected to the air-outlet pipe and extending toward the surface of thecylinder, substantially as described.

15. The combination with arevolving steam drying or heating cylinder ordrum provided with journals, of a steam-inlet pipe, an airoutlet pipe, apipe to which said air-outlet pipe is connected, said pipe passingthrough one of the journals, suitable packing whereby a tight joint isformed between the pipe and the journal, an arm secured to said pipe,and a projection on the journal-bearing with which the arm engages,substantially as described.

1 6. The combination with a revolving steam drying or heating cylinderor drum provided with journals, of a steam-inlet pipe, an airoutletpipe, a pipe to which said airoutlet pipe is connected, said pipepassing through one of the journals, suitable packing whereby a tightjoint is formed between the pipe and the journal, an arm secured to saidpipe, a projection on the journal-bearing with which the arm engages,and a plurality of pipes connected to the air-outlet pipe and extendingtoward the surface of the cylinder, substantially as described.

17. The combination with a revolving steam drying or heating cylinder ordrum having journals, of a steam-inlet pipe, an air-outlet pipe, a pipepassing loosely through one of the journals, the air-outlet pipe beingconnected at one end with said pipe by a sliding joint, a pipe passingthrough the other journal with which the other end of said air-outletpipe is connected, suitable packing for forming a tight joint betweensaid pipe and the journal, and means for preventing said pipe fromturning with the journal, substantially as de scribed.

18. The combination with a revolvingsteam drying or heating cylinder ordrum having journals, of a steam-inlet pipe, an air-outlet pipe, a pipepassing loosely through one of the journals, the air-outlet pipe beingconnected at one end with said pipe by a sliding joint, a pipe passingthrough the other journal with which the other end of said air-outletpipe is connected, suitable packing for forming a tight joint betweensaid pipe and the journal, means for preventing said pipe from turningwith the journal, and a plurality of pipes connected to the air-outletpipe and extending toward the surface of the cylinder, substantially asdescribed.

19. The combination with a revolving steam drying or heating cylinder ordrum having journals, of a steam-inlet pipe passing through one of thejou rnals,a support to which said pipe is connected, a yielding jointbetween said support and the journal, an airoutlet pipe extendingsubstantially across the cylinder, a pipe passing through the supportand the steam-pipe, said pipe being connected to the air-outlet pipe bya sliding joint, a pipe passing through the other journal, and asuitable connection between said pipe and the air-outlet pipe,substantially as described.

20. The combination with a revolving steam drying or heating cylinder ordrum having journals, of a steam-inlet pipe passing through one of thejournals, a support to which said pipe is connected, a yieldingjointbetween said support and the journal, an airoutlet pipe extendingsubstantially across the cylinder, a pipe passing through the supportand the steam-pipe, said pipe being connected to the air-outlet pipe bya slidingjoint, a pipe passing through the other journal, 2. suitableconnection between said pipe and the air-outlet pipe, and a plurality ofpipes connected to the air-outlet pipe and extending toward the surfaceof the cylinder, substantially as described.

21. The combination with a revolving steam drying or heating cylinder ordrum having journals, of a steam-inlet pipe passing through one of thejournals, a support to which said pipe is connected, a yielding jointbetween said support and the journal, a pipe for removing water ofcondensation, said pipe passing through the steam-pipe and beingconnected to the stationary support, an airoutlet pipe extendingsubstantially across the cylinder, a pipe passing through the stationarysupport and the steam-pipe, said pipe being connected to the air-outletpipe by a sliding joint, a pipe passing through the other journal, and asuitable connection between said pipe and the air-outlet pipe,substantially as described.

22. The combination with a revolving steam drying or heating cylinder ordrum having journals, of a steam-inlet pipe passing through one of thejournals, a support to which said pipe is connected, a yielding jointbetween said support and the journal, a pipe for removing water ofcondensation, said pipe passing through the steam-pipe and beingconnected to the stationary support, an airoutlet pipe extendingsubstantially across the cylinder, a pipe passing through the stationarysupport and the steam-pipe, said pipe being connected to the air-outletpipe by a sliding joint, a pipe passing through the other journal, asuitable connection between said pipe and the air-outlet pipe, and aplurality of pipes connected to the air-outlet pipe and extending towardthe surface of the cylinder, substantially as described;

In testimony whereof I have hereunto set my hand in the presence of twosubscribing 10 witnesses.

THOMAS H. SAVE-RY.

Witnesses:

-WILLIAM H. SAVERY,

HoWELL S. ENGLAND.

